Travel advisories for Sikkim may be issued due to:

Landslides during monsoons
Heavy snowfall
Unrest
All of the above

The correct answer is: All of the above.

Sikkim is a beautiful state in India that is home to the Himalayas. It is a popular tourist destination, but it is important to be aware of the risks before traveling there.

Landslides are a common occurrence in Sikkim during the monsoon season. The heavy rains can cause the ground to become unstable, leading to landslides. These landslides can block roads and railways, making it difficult to travel. They can also damage property and cause injuries or death.

Heavy snowfall is also a risk in Sikkim during the winter. The snow can make roads impassable and can also cause avalanches. Avalanches can be very dangerous, and they can cause serious injuries or death.

Unrest is also a risk in Sikkim. There have been protests and riots in the past, and these can make it dangerous to travel. It is important to be aware of the latest news and to check for travel advisories before traveling to Sikkim.

If you are planning to travel to Sikkim, it is important to be aware of the risks and to take precautions. You should check the weather forecast and road conditions before you travel. You should also make sure that you have a good travel insurance policy.